Create New File keyboard shortcut Ubuntu 18.04

I was wondering whether there is a possibility to assign a keyboard shortcut for creating a new empty file in Ubuntu 18.04 for nautilus. Namely if there is a possibility to assign a keyboard shortcut to the “Empty File” option generated by the right mouse click. The solution provided in [1]: http:////askubuntu.com/questions/53202/how-do-you-create-a-new-document-keyboard-shortcut does not appear…

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Librosa Display Waveplot, why are they totally blue and flat?

I followed this example of Music Synchronization with Dynamic Time Warping However, when I do this: import matplolib.pyplot as plt import librosa import librosa.display x_1, fs = librosa.load(‘musicdata/slow_melody.wav’) plt.figure(figsize=(16, 4)) librosa.display.waveplot(x_1, sr=fs) plt.title(‘Slower Version $X_1$’) plt.tight_layout() and same for the faster version, I get this result: I can properly reach the pitch classes of the…

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How do I properly set up the Cassandra client in Javascript?

Right now, I’m running a docker with Cassandra on it. I have a javascript file that sits outside the docker that needs to connect to Cassandra. I’ve found a node package that interfaces w/ JS, called cassandra-driver. However, with the following code: var cassandra = require(‘cassandra-driver’); var PlainTextAuthProvider = cassandra.auth.PlainTextAuthProvider; const client = new cassandra.Client({…

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Sending parameter request with RestSharp in C#. Getting Error: Required field \”expr\” missing in JSON body

I am writing a simple calculation machine application in Windows Form application. I want to perform operations using math js web api (post), but where I call api I get this error: Error: Required field \”expr\” missing in JSON body” // in Response My code is here : private void Equals_Click(object sender, EventArgs e) {…

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Vulkan — vkAcquireNextImageKHR throws std::out_of_range when certain queue families are used

TL;DR vkAcquireNextImageKHR throws std::out_of_range when certain queue families are used. Is this expected behavior? How to debug? Detailed description The Vulkan program I use is based on vulkan-tutorial.com. I discovered that my VkPhysicalDevice has three queue families, each flagged with VK_QUEUE_GRAPHICS_BIT and present support: uint32_t queueFamilyCount; vkGetPhysicalDeviceQueueFamilyProperties(device, &queueFamilyCount, nullptr); std::vector<VkQueueFamilyProperties> queueFamilies(queueFamilyCount); vkGetPhysicalDeviceQueueFamilyProperties(device, &queueFamilyCount, queueFamilies.data()); std::vector<uint32_t>…

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Why same output address is invalid in a transaction on Bitcoin Core?

I’m studying Bitcoin Core currently. I found incomprehensible code, that shows making a transaction is rejected if there are same output addresses in a transaction. See Fig1, Fig2 Origin source code : https://github.com/bitcoin/bitcoin/blob/8aac85d71e218783bc7ce06e5bf8bc660e24079d/src/rpc/rawtransaction_util.cpp#L95 So, the transaction illustrated in Fig1 will be rejected as shown Fig3. Can you give reason about the policy of described in…

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